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desc "imports the data from backup.sql"
task :db_import => :environment do
  filenam = 'backup.sql'
  production = YAML.load(File.read(File.join(RAILS_ROOT, "config/database.yml")))['production']
  db = production['database']
  username = production['username']
  password = production['password']
  %x{mysql #{db} < #{filename} -u #{username} -p#{password}}
  puts "====================================================="
  puts "Database imported successfully"

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require 'yaml'
require 'fileutils'

desc "takes db backup and stores it to /var/backups/timestamp.sql with"
  task :db_backup => :environment do
    production = YAML.load(File.read(File.join(RAILS_ROOT, "config/database.yml")))['production']
    db = production['database']
    username = production['username']
    password = production['password']
    t = Time.now

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new PeriodicalExecuter(function(){new Ajax.Request('/main/some_method', {asynchronous:true, evalScripts:true})}, 2)

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require 'open-uri'

class Some < ActiveRecord::Base

  # validates urls
    validates :url, :presence => true, :format =>  /(^$)|(^(http|https):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(([0-9]{1,5})?\/.*)?$)/ix,
    :uniqueness => true


  # validates email

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# using Iconv

iv = Iconv.new("UTF-8//IGNORE", "UTF-8")
content = iv.iconv(content)


# using String.encode

"string".encode(Encoding::UTF_8, :invalid => :replace, :undef => :replace, :replace => '')

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module ApplicationHelper

  def page_links(pages)
    will_paginate(pages, :class => 'pagination', :inner_window => 2, :outer_window => 0, :renderer => BootstrapLinkRenderer, :previous_label => '«'.html_safe, :next_label => '»'.html_safe)
  end

end

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# Simple configuration system
#
# The configuration is represented as a tree of keys. Examples:
#
#   AppConfig['key']
#   AppConfig['key','subkey']
#   AppConfig['key.subkey']
#
# An optional default value can be specified:
#

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1.9.3p194 :001 > a = 1,2,3,4,5,6,6
 => [1, 2, 3, 4, 5, 6, 6] 
1.9.3p194 :002 > a.methods.grep /groups/
 => [:in_groups_of, :in_groups] 
1.9.3p194 :003 > a.in_groups(2)
 => [[1, 2, 3, 4], [5, 6, 6, nil]] 
1.9.3p194 :004 > a.in_groups_of(2)
 => [[1, 2], [3, 4], [5, 6], [6, nil]] 

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example action and view code:

  def index
    page = params[:page].to_i.zero? ? 1 : params[:page].to_i
    kids = current_day_care.kids(page)
    @kids = kids[:kids]
    unless kids[:total].to_i.zero?
      @kids_pages = (1..kids[:total]).to_a.paginate(:page => page, :per_page => Kid::PerPage)
    end
  end

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# add the following JS code at the end of the ajax call.

FB.XFBML.parse();